Optical properties of the ash from El Chichon volcano

Details Optical properties of the ash from El Chichon volcano Optical properties of the ash from El Chichon volcano

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..317p&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 10, April 1983, p. 317-320.

Physics

13

Aerosols, Ashes, Volcanoes, Chemical Composition, Mexico, Optical Properties, Silicates, Stratosphere

Scientific paper

The visible wavelength optical properties of the ash from the 1982 El Chichon eruptions are measured using ash samples collected at three surface sites at distances between 12 and 80 km from the volcano. The most distant sample is assumed to be the most representative of the silicate ash injected into the stratosphere. The measured optical properties are presented as a complex refractive index n, while the aerosol absorption is expressed as the imaginary component of the refractive index, n sub IM. Results show that each of these samples exhibited low values of absorption, with n sub IM at 500 nm ranging from 0.0015 for the 12 km sample to 0.001 for the 80 km sample. Based on these measurements, it is estimated that n for the stratospheric silicate ash is given by n = 1.53 - 0.001i.

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